Abstract:

Through reactions, chemical substances are transformed into new substances. Oxidation reactions of alcohols are essential transformations in organic chemistry. The oxidation of alcohols to aldehydes, ketones, and carboxylic acids is among the most important and widely used class of oxidation reactions in organic chemical synthesis. Chemical reactions can be the articulating axis of the study of properties and characteristics of substances. In this context, a didactic proposal was created for the study of oxidation reactions of alcohols. Padlet was used to support the educational activity; it was chosen because is an online tool, easy to use, which allows the user to store different types of materials on the wall (text, images, videos, etc.). The objective of this work is to describe the structure of the didactic proposal created for the study of oxidation reactions of alcohols, as well as the results of its application. The didactic proposal was applied in an Organic Chemistry class composed of Technician in Chemistry (After High School) students. Parallel to the development of the study, the students were encouraged to create a virtual board – using the Padlet – that systematized the main concepts, applications and meanings related to the oxidation reactions of alcohols. The didactic proposal was developed in 6 stages.
The first stage consisted of presenting the theme (oxidation reactions of alcohols) and the presentation of subsidies for the construction of the virtual board, with guidelines on how to build it using Padlet (registration, access to the platform, how to create boards in Padlet, how to share virtual frames).
The second stage involved guidance on the study of alcohol oxidation reactions, with clarification on the purpose of the third and fourth stages.
The third stage involved the resumption of basic contents of organic chemistry.
The fourth stage involved the study of oxidation reactions of alcohols, whose development was guided by 5 activities/questions related to:
a) characterization of oxidation-reduction reactions in the context of organic chemistry;
b) identifying the possibilities of oxidation reactions of alcohols;
c) determination of the oxidation number (Nox) in organic compounds and its relationship with the identification of oxidation processes of organic substances;
d) investigation of the chemical reactions involved in the transformation of ethanol into acetic acid in the production of vinegar; and,
e) research, within the scope of qualitative chemical analysis of organic compounds, of oxidation reaction(s) involving alcohols.
The fifth step involved the creation of a virtual board (Padlet) that should present the “findings” linked to steps 3 and 4 as content, in order to provide an understanding of the oxidation reactions of alcohols, their principles and applications.
The sixth stage involved the presentation, in class, of the Padlet created by each of the students.
The details of each of the stages of the didactic proposal for the study of oxidation reactions of alcohols, as well as the results of its application will be presented in the final paper.

Acknowledgements:
This study was supported by the ​Federal Institute of Education, Science and Technology of Rio Grande do Sul (IFRS)​, IFRS/CNPq.

Keywords:

Padlet, chemistry education, organic chemistry.